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Investments - Analysis of Cost or Amortized Cost, Gross Unrealized Gains and Losses and Fair Value for Investments (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Debt Securities    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost $ 9,224 $ 8,871
Gross Unrealized Gains 493 607
Gross Unrealized Losses 42 18
Fair Value 9,675 9,460
Debt Securities | Corporate    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 5,243 5,117
Gross Unrealized Gains 350 420
Gross Unrealized Losses 16 11
Fair Value 5,577 5,526
Debt Securities | States, municipalities and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 3,426 3,267
Gross Unrealized Gains 136 178
Gross Unrealized Losses 15 2
Fair Value 3,547 3,443
Debt Securities | Commercial mortgage-backed    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 278 250
Gross Unrealized Gains 7 9
Gross Unrealized Losses 2 0
Fair Value 283 259
Debt Securities | Government-sponsored enterprises    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 253 213
Gross Unrealized Gains 0 0
Gross Unrealized Losses 9 5
Fair Value 244 208
Debt Securities | Foreign government    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 10 10
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 10 10
Debt Securities | Convertibles and bonds with warrants attached    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 7 7
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 7 7
Debt Securities | United States government    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 7 7
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 7 7
Equity Securities    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 2,828 2,728
Gross Unrealized Gains 1,915 2,134
Gross Unrealized Losses 9 4
Fair Value 4,734 4,858
Equity Securities | Common equities    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 2,628 2,583
Gross Unrealized Gains 1,882 2,099
Gross Unrealized Losses 8 3
Fair Value 4,502 4,679
Equity Securities | Nonredeemable preferred equities    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 200 145
Gross Unrealized Gains 33 35
Gross Unrealized Losses 1 1
Fair Value 232 179
Fixed Maturities And Equity Securities    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 12,052 11,599
Gross Unrealized Gains 2,408 2,741
Gross Unrealized Losses 51 22
Fair Value $ 14,409 $ 14,318